Blowpipe



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Nov. 13, 1923.

um LE LN` M n ma MMV o# Y The gas mixers lmay and durable.

Patented Nov. 13, lggg.

LORN CAMPBELL, JR., 0F

WELDING' COMPANY, 0F

EGTA.

alipucation mea 'iaay s,

To all wiwm it may concern.:

`lie it known that I, LORN CAMPBELL, J r., a citigen of the United States, residing at Minneapolis, in the county of Hennepin and State `of Minnesota, have invented certain new and useful lmprovements in Blow-- pipes; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use. the same.

My invention relates to what is known as blowpipes or torches of the character used to mix and burn various different gases, such as acetylene-and oxygen, and the particular object of the invention is the provi-v sion of improved means for adaptin -the blowpipe or torch for different kin s of work, or to different gases, or to different conditions.- Y

This improved means includes interchangeably usable gas mixers, and such interchangeable mixers may be applied in any convenient part of the'blowpipe `or torch. be interchanged simply by the substitution of the one. for the other and without disturbing or disassembling the tip or any other part of the blowpipe or torch.

ln accordance with my invention, I-accomplish the above objects by the useof simple construction which is inexpensive to manufacture, convenient to use and strong The invention is illustrated in the. accompanying drawings, wherein like characters indicate like parts throughout the several views. l

Referring-to the drawings:

Fig. 1 is a vertical section taken centrally through the head, tip and mixer of the blowpipe, the part of the latter being in full; and

Figs. 2, 3 and 4c are views partly in elevation and partly in axial section showing gas mixers on a large scale removed from the head of the blowpipe.

The head 5 of the blowpipe has an internal threaded axial passage 6' and is provided at its upper end with a laterally projecting shank 7, formed with a cylindrical chamber V8, adapting it to be secured tothe outer tube (not shown) of the blowpipe, in the usual or suitable way. Passages 9 and 10 lead from the chamber 8 into the interior of the 4head 5, the former being above the -latnally interet-f* entre stares artnr Aerre.,

MINNEAPOLS, MINNESOTA, ASSGNGR TO UNTED STATES MINNEAPOLIS, MINNESOTA, A CORPRATION 0F MINNE- snowman.

1920. Serial N0. 378,358. I

The burner tip 11 has a threaded shank 'that is screwed into the threaded interior 6 of the head vand is provided with a beveled shoulder that engages a beveled surface of the headl 5, at 12, making a gas tight jolnt.

The three interchangeable usable gas mixers illustrated lin the drawings are exten nally alike, and each comprises a cylindrical body or plug 13, having an outer end 14 ,formed with a beveled surface 15. The cylindrical bodies of the gas mixers are exteri threaded for engagement with the in ternal threads 6 of the head -5, but some of these threads are omitted onY the outer end portions of the plug, so as to leave a smooth exterior surface 16A of reduced diameter, just inward of the beveled surface 15.' Also, the interior of the head 5 is leftl smooth or 'unthreaded for considerable distance near its upper end, so that when the mixer is screwed to position, its gas tight joint with the upper end of said head, and will leave an annular channel 17, surrounding the surface 1 6, into which the gas passa e 9 directly o ens. Also, the exterior sur ace of the. bo y ofeach mixer 13.' is reduced slightly in diameter at 18, so as to leave an annular surrounding channel, into rectly opens to the inserted mixer.

Preferably, and as shown,

inner end of each mixer 1.3 is reduced andtelescoped 'through a pocket 11, formed in the inner end of burner tip 11.- v

Each gas mixer 13 is provided with a diametrical passage 19, the extremity or which, in the applied plug, will, be in communication with .the axial chamber 17 and hence with the oxygen gas passage 9. n 'lfhe gas mixer shown, as applied in Fig.:l 1 is identical with the mixer shown in Fig. 4f and this mixer has an axial passage 2O of coistant diameter, and it further has a plu ra it the alnnular chamber formed by the reduced portion 18, to the intermediate portion of the axial passage 20. The said axial paswhich the acetylene delivery passage 10fdi' beveled surface 15 forms a extend through va larger be rigidly secured to the 1 the lower and of radial passages 21 that lead from sage at its upper extremities terminates in the diametrical passage 19, but at its lower extremities it delivers directly to the axial passage of the burner tip 11.l

rllhe plu shown in Fig. 3 is like that shown in. ig. 4, except that its axial passage comprises a relatively small upper portion 20a and relatively large lower portion 20", the latter of which extends from the radial passage 21 to the delivery end of the much smaller diameter than shown in Figs. 2, 3 and'4 are adapted for mixing acetylene and oxygen 0r other gases under dierent pressure 'or'conditions ln the mixer shown in Fig. 2, oxygen gas under considerable pressure passes from bushing 23 through contact passage 24, thence through the larger passage 22, thereby producing a suctionwhich will draw the acetylene gas through ports 20, so that practically no pressure is required on the acetylene gas, in this type of mixer. Under-certain conditions and for certain purposes, this mixing action will give the best results and it; has the advantagethat the acetylene gas being carried at low pressure reduces to the minimum the danger incident to the use of acetylene gas.

The mixer shown in Fig. 3 is adapted for luse when lthe pressure on the acetylene and oxygen gases are equal or balanced, and this 'mixer has the advantage that back-firing cannot` take place therem.

-The mixer .shown in Fig. 4 is adapted for usewith low pressure oxygen gas, and high pressure acetylene gas. This mixer in Fig.

4f (shown also in Fig.- 1) is desirable when welding certain alloy metals where. there is danger of oxidizing the weld. A

ln the use of either of the mixers shown i in Figs. 3 and' 4, it will requentlyhappen that the pressure of the acetylene gas in the supply tank will be reduced to a point where the supply will not be properly afforded;

, the mixer shown in Fig. 2 may be substituted rand-then the residue of :the low pressure, acetylene gas remaining in the tank can be 5 drawn out by suction produced when the said mixer (Fig. 2) is applied.

From what has been said, it will be under stood that this invention is capable of variation as to detail-of construction and arrangement". of parte.

maaien what i aim is:

1. A blowpipe comprising av headl'and having a'gas mixer, a discharge nozzle tip secured` therein, each being removable without disturbing any other part of the blowplpe. v K 4 2. A blowpipe comprising a head and having a gas mixer, a discharge nozzle tip secured therein, each extending therein'from opposite endsl and being in longitudinalv alinement.

3. A blowpipe havingin combination a cylindrical head having a laterally extending connecting portion formed thereon havi lng a chamber therein, said head having a threaded bore extending therethrough, and

passa es leading from said cham-ber thereto,

a disc arge tip secured'in one end of said bore from one end, anda removable formin a gas mixer screwed into said from t e other end.

4.A blowpipe comprisinga head having .a threaded-bore therethrough and having a connecting chamber and passages leading from said chamber to said bore,- a tip having a central bore and bein screwed'into the end of the bore in said ead from one end thereof, and a mixing plug screwed' into the bore in said .head from vthe other end thereof, said plug having a central |bore and having passages connect-ing the same with the passages in said head.

5. A blowpipe comprising a head having a cylindrical portion having a threaded bore extending therethrough and having a laterally extended portion vhaving a chamber'` therein, and oxygen and acetylene passages titi.

from said bore communicating` therewith, a

tip screwed into said bore from one end having a long1tudinal passage therethrough and a mixing plug screwedinto said bore from the other end and having passages therethrough connecting said oxygen and acety- 'f lene passages with the passage in said tip.

6. A blowpipe comprising a head having fa connecting chamber and an inclined hol-v low interiorly threaded portion, a One-piece as mixing device screwed into said portion rom one end, a tip nozzle screwed into saidv portion from the other end, each, of the two latter devices being removable without disturbing the other.

7. A blowpipe having a head at its discharge end having alaterally extendingi projection adapted to be connected to oxygen and acetylene supply devices, a removable mixingplugadapted to mix said gases disposed in said head and insertable therein from one end, and a removable dischar e' nozzle tip disposed in-and insertable 'in said head from 'its other end, said being removable and insertable wlthout disturbing any other part of said blowpipe.

ln testimony whereof l a my-si ature. LORN CAMPBEL Jn plug and tip 

